The erythroneurine genus Alnetoidia is redescribed and four new species are described and illustrated from China. A species checklist and a taxonomic key to species is also provided.

Crown whitefly, Aleuroplatus coronata (Quaintance 1900), and gelatinous whitefly, A. gelatinosus (Cockerell 1898) were re-described from syntype specimens and from material recently collected in southern California. The recently collected material includes all postembryonic life stages which are all described herein. The original descriptions focused on the fourth instar or “pupa” with little or no mention of other life stages. The 16S rDNA of both species was extracted from adults, amplified by PCR, and sequenced. Sequence alignment between the two species indicates a high degree of divergence as they show only an 80% degree of similarity.

The subgenus Dicerca (Neoargante) Nelson 2006 is considered unnecessary and proposed as a new junior subjective synonym of Dicerca Eschscholtz 1829. Polybothris lesnei Théry 1926 is transferred to Holynskirbus Özdikmen 2008 ( =  Sororcula Hołyňski 1993) and Sororcula gnomiphila Hołyňski 1993 is proposed as a new junior subjective synonym of H. lesnei.